When Prior to which amendment were slaves counted as only 35 of a person?

Prior to the 14th Amendment, which was ratified in 1868, enslaved individuals were counted as three-fifths of a person for purposes of representation and taxation under the Three-Fifths Compromise established in the U.S. Constitution in 1787. This compromise was a contentious political solution aimed at balancing the interests of slaveholding and non-slaveholding states in terms of congressional representation. The 14th Amendment ultimately abolished this practice by granting full citizenship and equal representation to all individuals born or naturalized in the United States.